The frequency of a wave is inversely related to its wavelength when the speed of the wave remains constant. The relationship can be described by the equation:
\[ v = f \lambda \]
where \( v \) is the speed of the wave, \( f \) is the frequency, and \( \lambda \) is the wavelength.
If the wavelength (\( \lambda \)) is tripled, and the speed (\( v \)) remains constant, the frequency (\( f \)) will decrease. Specifically, if the wavelength is tripled, the frequency will become one third of its original value.
So the correct response is:
It will become one third of its original value.